Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad64c75817669fea…

MALICIOUS

PDF

84.4 KB Created: 2021-09-06 20:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4c3f5f001a8a7788669f19b389ffd7c6 SHA-1: dddd52fc4d1e89322e90472bbbdb5c2fd3de2c39 SHA-256: ad64c75817669fea2af288196bfed80313f7a59e5d284544bee6938eea2e4b29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of multiple PDF link farm heuristics points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/uplcv?utm_term=new+jersey+dmv+motorcycle+manual PDF link annotation
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d489041b5---lujobugaguregozosibowepi.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/2bbe9e319a293303206bb8684b9131fd/84937110753.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/69691663443.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120a4fc62ae3---53430369346.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/kirej.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/30496766622.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/95875098049.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021080615051273499.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/16731536841.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/5560958130.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/fuvuxetevuluxelukumi.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/matokikariz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5460339ff2---mitasivopetuvozopome.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec9d2735c1---87262005244.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/xodilomaj.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/janav.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/17062841376.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/nurakufuvomivefukutoz.pdfIn PDF document text
    • http://ipublicity.cz/data/file/dugejubewimapoladenuk.pdfIn PDF document text
    • https://factinet.com/uploads/files/lijikexeviwujona.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ade99ad71a---wewokat.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210629_064148.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 10912 bytes
SHA-256: 79da828ab07b156e9ddc623bb5f3b55a8c0ee5d60a5d467ff0e73c1bbbfb121b
font_01_sfnt_off0000febe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D0 16864 bytes
SHA-256: 4954900ad3f077609045f8f2848e6a9b5aea2a4a2ee28c731aba296b8a936903